test: "cleanup" function

Author: aleclarson

src/__tests__/cleanup.test.js

@@ -0,0 +1,24 @@
+// @flow
+/* eslint-disable react/no-multi-comp */
+import React from 'react';
+import { View } from 'react-native';
+import { cleanup, render } from '..';
+
+class Test extends React.Component<*> {
+  componentWillUnmount() {
+    if (this.props.onUnmount) {
+      this.props.onUnmount();
+    }
+  }
+  render() {
+    return <View />;
+  }
+}
+
+test('cleanup', () => {
+  const fn = jest.fn();
+  render(<Test onUnmount={fn} />);
+  expect(fn).not.toHaveBeenCalled();
+  cleanup();
+  expect(fn).toHaveBeenCalled();
+});